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Ruby: Call method with absolute path.
Method call.
Book.example
If it is an absolute path, it can be written as follows.
::Book.example
This is useful, for example, when calling a class of the same name from within a module.
class Book def self.example p 'Class' end end module Example class Book #このモジュールの example を呼ぶ def self.call_module_method Book.example end # 普通のClass の example を呼ぶ def self.call_class_method ::Book.example end def self.example p 'Module' end end end Example::Book.call_module_method Example::Book.call_class_method
Execution result
"Module" "Class"
- I don't know if the word "absolute path" is correct or not, but I had a hard time knowing the keyword when I was making a note.
- I thought I could call it in
Class::Book.examplebut it was different. (The part of Class is ignored)
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公開日時
2019-04-16
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